Results 1 to 6 of 6

Thread: trans took a dump?

  1. #1
    Forum User Feedback Score 0
    Join Date
    Oct 2010
    Owner Since

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts

    trans took a dump?

    Went over a bump (rr tracks actually) and then it immediately started running not so good. I managed to limp home. It would idle fine at high RPM, but when driving any attempt to push it over 2k rpm would result in surging/oscillation behavior. So I would shift up and keep the rpm in a range that it balked along. Speedometer was intermittently inoperative during the drive home. I thought I smelled some clutch or other material at some point, but it may have been a nearby vehicle.

    Have not put it up on stands yet to make sure thing are mechanically okay (wheels spin, etc). Will do so tomorrow during daylight. The symptoms (speedo working/not working on and off) make me suspect output shaft or VCU or maybe passenger side CV.

  2. #2
    One day....it will be on 4 wheels. supporter Feedback Score 2 (100%)
    Join Date
    Sep 2010
    Owner Since
    2004

    Posts
    1,822
    Thanks
    154
    Thanked 37 Times in 30 Posts
    Electrical issue?
    Building a House, Car Mods on hold!
    1996 GTO, Owner since 2003.

  3. #3
    Forum User Feedback Score 0
    Join Date
    Oct 2010
    Owner Since

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by MR2 View Post
    Electrical issue?
    hmm. can't rule out electrical, but my gut tells me it's something mechanical. I'd be glad to be wrong though.

    I just got the front end up on stands and there is no obvious trauma (cracked xfer case, broken shafts or CV boots, etc.). Front wheels spin in opposite directions when spun by hand, as they should.

    I checked, battery voltage is ~12.5 vdc when engine is off, 14 or so when it's on. No prob there. I have had an alternator go bad before and recall a 'surging' type behavior, but this is a bit different.

    Also one more thing I observed was the speedo at zero while moving at 15 mph or so, then while in neutral, adding a bit of throttle brought the speedo back momentarily. That's in-line with your electrical theory, I would think.

    I removed the negative batt cable for a bit to let the ECU reset, then drove it up and down the street. Same behavior. ECU is giving the all clear code.

    I swapped in my spare ECU, same behavior.

    Also another thing (first thing actually) I checked was whether the air intake tube had popped off. It's on securely.

    Don't know if it matters, but I filled up the gas tank today about 5 miles later this began. I tend to doubt bad gas though.
    Last edited by rt91tt; 11-14-2010 at 12:17 AM.

  4. #4
    One day....it will be on 4 wheels. supporter Feedback Score 2 (100%)
    Join Date
    Sep 2010
    Owner Since
    2004

    Posts
    1,822
    Thanks
    154
    Thanked 37 Times in 30 Posts
    oddly I had something similar and it was the MAS..I somehow got water or something into it's sensor...your speedo not working is odd too! did any lights come on in the dash? don't suppose you have a logger?

  5. #5
    Forum User Feedback Score 0
    Join Date
    Oct 2010
    Owner Since

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by MR2 View Post
    oddly I had something similar and it was the MAS..I somehow got water or something into it's sensor...your speedo not working is odd too! did any lights come on in the dash? don't suppose you have a logger?
    No CIL illumination, ECU code reads normal with an analog multimeter. I don't have a datalogger unfortunately. maybe it's time it invest in a cheap one, any recommendations?

  6. #6
    Forum User Feedback Score 0
    Join Date
    Oct 2010
    Owner Since

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts
    It was the ECS. Unplugging ECS wiring harness restored normal engine operation.

    I recapped the ECS for good measure (could have just left it unplugged, but hey).

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
3000GT / Stealth / GTO Resources
3000GT / Stealth / GTO / Multi-site Classifieds
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive